Slow cooker



FIG. 1 is a front perspective view of the design of the slow cooker;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view with the left side being a mirror image thereof; and,

FIG. 4 is a top plan view thereof.

The broken lines shown are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a slow cooker, as shown and described. 